|
||
|
24th January 2019, 08:26 | #1 |
Avid contributor
Rover 75 Tourer 2.0 V6 LPG Join Date: Apr 2018
Location: Colchester
Posts: 210
Thanks: 4
Thanked 50 Times in 39 Posts
|
Minimising air locks when fitting heater matrix
What's the best way of minimising air locks in cooling system when changing heater matrix ? Don't want to drain whole system if I can help it !
Rover has recently had new water pump and new coolant fitted by Lates with his vacuum gizmo,when he did cam belts for me,so at mo know I have no air locks in system. Would this work ? Am planning to clamp heater matrix rubber flow and return hoses shut under bonnet when I replace heater matrix to save draining whole system of coolant. Noticed the upper rubber hose from heater matrix runs behind battery box under bonnet and there is a join in pipe there. So after new heater matrix is fitted i'm thinking of removing battery and battery box to get to the join in upper heater matrix pipework,leave rubber heater hose radiator side clamped off and,before unclamping lower heater rubber hose,remove the other upper rubber heater hose(the one that comes from top of heater matrix) from the join behind battery box,hold hose vertical and slowly top up new heater matrix through this hose. In theory,by gravity,new heater matrix and upper hose should then be pretty much free of air. Then,refit hose to pipe join behind battery box,release hose clamps from top and bottom heater hoses and there shouldn't be much,if any air in cooling system. Maybe undo and hold header tank up in the air when I first start engine too. Paul |
24th January 2019, 09:02 | #2 |
I really should get out more.......
Rover 75 Saloon Join Date: Jul 2011
Location: Gävle
Posts: 2,534
Thanks: 395
Thanked 823 Times in 652 Posts
|
Sounds a bit complicated and while I understand your wish to minimise the chances of an air lock, I don’t think you can avoid getting some air in the system. However if you bleed it correctly and continue to monitor the temperature as you are doing all should be fine.
My latest KV6 defeated the professionals https://the75andztclub.co.uk/forum/s....php?p=2690481 who had vacuum bled but still not managed to clear the airlock. I can only assume that they didn’t know about raising the expansion tank which is a bit odd but old school. I was talking to an ex-scrapyard owner yesterday who told me that Renault used to have a problem too with bleeding and remembered using a very large water bottle suspended from the garage ceiling plumbed into the coolant system, using gravity and the weight of water to eject air. Good luck, it’ll be worth all the effort when you get really hot air out of the heater. Mike ps. Love the Firebird, my son had one too until he made the mistake of getting married |
24th January 2019, 19:29 | #3 | ||
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,375
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Quote:
Quote:
Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
||
|
|